I have 4 gsds- 2 sl and 2 wls- my wls- one year and 3 year old- have developed into high drive dogs who always have to be doing something for sure.
From my perspective these dogs are great and easy to train but do become a PIA over time.
In contrast to my sls who are content to lie around the house.
Ironically my new pup now 1 year old- a Bomber son- was cool calm and lower drive at 6 months when I got him. Now......he can be crazy.

Just wishing my guys had less energy. I do not think I will get a wl again.